/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraDataInterfaceRWUtils.h
Translates named attribute into actual attribute index.
[FString](API\Runtime\Core\Containers\FString) GetAttributeIndex ( const [FAttributeInfo](API\Plugins\Niagara\FNiagaraDataInterfaceRWAttribute-\FAttributeInfo) * AttributeInfo, int Channel ) const